Ariver current has a velocity of 5 km/h relative to the shore. a boat moves in the same direction as the current at 4 km/h relative to the river.

how do you calculate the velocity of the boat relative to the shore?

divide the river’s velocity by the boat’s velocity

subtract the boat’s velocity from the river’s velocity

add the river’s velocity to the boat’s velocity

Correct Answer is

add the river’s velocity to the boat’s velocity

Explanation

In this question  we have given ,both current and boat are moving in same direction.

let be velocity of current

and  bw velocity of boat

velocity  of current with respect to shore =velocity of current -velocity of shore..............(1)

velocity of boat with respect to river,=velocity of boat-velocity of current.........(2)

add equation (1) and equation (2)

velocity of velocity  of current with respect to shore+velocity of boat with respect to river =velocity of current(river) -velocity of shore+velocity of boat-velocity of current(river)

it means velocity of the boat relative to shore=rivers velocity relative to shore+boat velocity relative to river

velocity of the boat relative to shore=

velocity of the boat relative to shore=

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.